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CLARKSVILLE, Tenn -- Clarksville Police are investigating four robberies in the early morning hours of Monday and Tuesday and say one man was likely responsible for three of them.

The first robbery was reported at the Exxon at 4015 Trenton Road at 2:44 a.m. Monday. A black male wearing a black knit hat, green balaclava face mask, military-style camouflage shirt, gray pants, gloves and a military-style camouflage backpack entered the business and displayed a black semi-automatic handgun with a black barrel, according to a Clarksville Police Department press release. He demanded money and left the area on foot, according to the release.

The same store was robbed again Tuesday at about 1:20 a.m. A black male wearing a black ski mask, black long-sleeve shirt, dark-colored pants and black gloves with a white design on top, entered the business and displayed a black semi-automatic handgun with a silver barrel, according to police. The suspect demanded money and left the area on foot, police said.

Police say two different people are likely responsible for the two robberies at the Exxon.

The next robbery was reported at about 2:03 a.m. Tuesday at the Shell station at 3090 Wilma Rudolph Blvd. That suspect matched the description of the man who had robbed the Exxon 40 minutes earlier.

He displayed a black semi-automatic handgun with a silver barrel, demanded money and then fled on foot, police said.

The fourth robbery was reported at 2:14 a.m. Tuesday at the Speedway at 2475 Tiny Town Road. The suspect again matched the description from the Exxon and Shell robberies. The suspect also displayed a black semi-automatic handgun with a silver barrel and demanded money and left the area on foot, police said.

Police urge customers or individuals who visited those businesses or nearby businesses around the times of the robberies to contact the Clarksville Police Department if they observed anything that might be helpful to detectives.